I doubt it is only a Mac book issue. I have always sworn that the different USB ports on my various PC laptops work differently, with different devices and even with chargers. I wasn't nuts.

Primary: MD600, MS200 (SpeakerLink to AES), Trinnov ST-2, Ayre V6-xe, Salk SS8 3x LRC.
Secondary: MC600 (whole house).
Zone one: 568.2, G57, MS200, Spatial Hologram M2SE.
Zone 2-6 (Awaiting assignment).